<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>表格</title>
</head>  <!-- table:表格,thead:表头,tbody:中部,tfoot:表尾-->
<body>
   <table border="1"> <!-- border:边框,colspan:行合并，-->
     <thead>  <!-- tr:行,td:列,th:列(加粗)-->
       <tr>
           <td>序号</td>
           <td>姓名</td>
           <td>年龄</td>
           <td>身高</td>
       </tr>
     </thead>
     <tbody>
       <tr>
           <td>1</td>
           <td>张三</td>
           <td>15</td>
           <td>175</td>
       </tr>
       <tr>
           <td>2</td>
           <td>李四</td>
           <td>17</td>
           <td rowspan="2">173</td>
       </tr>
     </tbody>
     <tfoot>
       <tr>
           <td>平均年龄</td>
           <td colspan="2">16</td>
       </tr>
     </tfoot>
   </table>
</body>
</html>